ICS-CERT (Industrial Control Systems Cyber Emergency Response Team) Alerts are official notifications intended to inform owners and operators of critical infrastructure about vulnerabilities, threats, or incidents relevant to industrial control systems. Their primary purpose is to provide actionable information so that organizations can take necessary steps to protect their IACS environments from evolving cyber risks. While alerts may cover sector-specific threats (including energy), their main audience is critical infrastructure owners and operators.
Reference: ISA/IEC 62443-2-1:2009, Section 6.2.6 ("Incident response and reporting"); CISA ICS-CERT Mission Statement (https://www.cisa.gov/ics).